import javax.swing.tree.TreeNode;

public class Exercise16 {
    public boolean isSameTree(TreeNode p, TreeNode q) {
        // 如果二叉树为空则返回false
        if(p == null && q == null) {
            return true;
        }else if(p == null || q == null) {
            return false;
        }else if(p.val != q.val) {
            return false;
        }else {
            return isSameTree(p.left,q.left) && isSameTree(p.right,q.right);
        }
    }
}
